gulp-function/README.md

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# gulp-function
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accepts a function call as parameter to execute in gulp pipeline
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## Availabililty
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[![npm](https://pushrocks.gitlab.io/assets/repo-button-npm.svg)](https://www.npmjs.com/package/gulp-function)
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[![git](https://pushrocks.gitlab.io/assets/repo-button-mirror.svg)](https://github.com/pushrocks/gulp-function)
[![docs](https://pushrocks.gitlab.io/assets/repo-button-docs.svg)](https://pushrocks.gitlab.io/gulp-function/)
## Status for master
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[![build status](https://GitLab.com/pushrocks/gulp-function/badges/master/build.svg)](https://GitLab.com/pushrocks/gulp-function/commits/master)
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[![Dependency Status](https://david-dm.org/pushrocks/gulp-function.svg)](https://david-dm.org/pushrocks/gulp-function)
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[![bitHound Dependencies](https://www.bithound.io/github/pushrocks/gulp-function/badges/dependencies.svg)](https://www.bithound.io/github/pushrocks/gulp-function/master/dependencies/npm)
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[![bitHound Code](https://www.bithound.io/github/pushrocks/gulp-function/badges/code.svg)](https://www.bithound.io/github/pushrocks/gulp-function)
[![TypeScript](https://img.shields.io/badge/TypeScript-2.x-blue.svg)](https://nodejs.org/dist/latest-v6.x/docs/api/)
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### Usage
```typescript
import * as gulp from "gulp";
import gulpFunction from "gulp-function"; // default ES6 export
// import {forFirst, forEach, atEnd} from 'gulp-function'
let myAsyncFunction = async (file, enc) => {
// await some async stuff
};
gulp.task("gulpTest", function() {
let stream = gulp
.src("./mydir/*.something")
.pipe(gulpFunction(myFunction, "forEach")) //read the notes below
// .pipe(forEach(myFunction)) // if imported as >> import { forEach } from 'gulp-function' <<
.pipe(gulp.dest("./build/"));
return stream; // by returning the stream gulp knows when our task has finished.
});
```
### Notes
* The first argument of gulpFunction can also be an **array of multiple functionnames**.
Each function can return a promise. The pipe stop will finish when every promise is fullfilled.
When providing an array of functions be careful with modifying the file object -> race condition
* The second argument can be empty, it defaults to "forEach"
* The following options are available:
* "forFirst" - executes when first chunk/vinylfile of the stream reaches the pipestop.
file is pushed further down the line when function's returned promise is fullfilled.
* "forEach" - executes like "forFirst" but with every chunk/vinylfile in the stream;
* "atEnd" - executes after all chunks have passed and are processed in full.
That means the stream's "finish" event fires **before "atLast" is executed**!!!
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For further information read the linked docs at the top of this README.
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> MIT licensed | **&copy;** [Lossless GmbH](https://lossless.gmbh)
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> | By using this npm module you agree to our [privacy policy](https://lossless.gmbH/privacy.html)
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[![repo-footer](https://pushrocks.gitlab.io/assets/repo-footer.svg)](https://push.rocks)